Diffusion is one form of passive transport that doesn't require the expenditure of cellular energy. A molecule can diffuse passively through the cell membrane if it's lipid-soluble, uncharged, and very small, or if a carrier molecule can assist it. ... The assisted process is known as facilitated diffusion.
Got this off google but still hope it helps :)
A. off a surface at the same angle it strikes the surface
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The oxygen in inhaled air passes across the thin lining of the air sacs and into the blood vessels. This is known as diffusion. The oxygen in the blood is then carried around the body in the bloodstream, reaching every cell. When oxygen passes into the bloodstream, carbon dioxide leaves it.
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The Fifteenth Amendment gave the right to vote to former slaves and people of color. Well, the Nineteenth Amendment gave the right to vote to women, and the Twenty-third, Twenty-fourth, and Twenty-sixth amendments gave representation to the District of Columbia, outlaw poll taxes, and lowered the voting age to 18.
